Early-type galaxy spin evolution in the Horizon-AGN simulation
Using the Horizon-AGN simulation data, we study the relative role of mergers and environmental effects in shaping the spin of early-type galaxies (ETGs) after $z \simeq 1$. We follow the spin evolution of 10,037 color-selected ETGs more massive than 10$^{10} \rm \, M_{\odot}$ that are divided into f...
| Main Authors: | , , , , , |
|---|---|
| Format: | Journal article |
| Published: |
American Astronomical Society
2018
|
| _version_ | 1797077763974234112 |
|---|---|
| author | Choi, H Yi, S Dubois, Y Kimm, T Devriendt, J Pichon, C |
| author_facet | Choi, H Yi, S Dubois, Y Kimm, T Devriendt, J Pichon, C |
| author_sort | Choi, H |
| collection | OXFORD |
| description | Using the Horizon-AGN simulation data, we study the relative role of mergers and environmental effects in shaping the spin of early-type galaxies (ETGs) after $z \simeq 1$. We follow the spin evolution of 10,037 color-selected ETGs more massive than 10$^{10} \rm \, M_{\odot}$ that are divided into four groups: cluster centrals (3%), cluster satellites (33%), group centrals (5%), and field ETGs (59%). We find a strong mass dependence of the slow rotator fraction, $f_{\rm SR}$, and the mean spin of massive ETGs. Although we do not find a clear environmental dependence of $f_{\rm SR}$, a weak trend is seen in the mean value of spin parameter driven by the satellite ETGs as they gradually lose their spin as their environment becomes denser. Galaxy mergers appear to be the main cause of total spin changes in 94% of central ETGs of halos with $M_{vir} > 10^{12.5}\rm M_{\odot}$, but only 22% of satellite and field ETGs. We find that non-merger induced tidal perturbations better correlate with the galaxy spin-down in satellite ETGs than mergers. Given that the majority of ETGs are not central in dense environments, we conclude that non-merger tidal perturbation effects played a key role in the spin evolution of ETGs observed in the local ($z < 1$) universe. |
| first_indexed | 2024-03-07T00:22:40Z |
| format | Journal article |
| id | oxford-uuid:7d15ce55-26d1-4ae9-8fa3-192a62affb88 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T00:22:40Z |
| publishDate | 2018 |
| publisher | American Astronomical Society |
| record_format | dspace |
| spelling | oxford-uuid:7d15ce55-26d1-4ae9-8fa3-192a62affb882022-03-26T21:01:05ZEarly-type galaxy spin evolution in the Horizon-AGN simulationJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:7d15ce55-26d1-4ae9-8fa3-192a62affb88Symplectic Elements at OxfordAmerican Astronomical Society2018Choi, HYi, SDubois, YKimm, TDevriendt, JPichon, CUsing the Horizon-AGN simulation data, we study the relative role of mergers and environmental effects in shaping the spin of early-type galaxies (ETGs) after $z \simeq 1$. We follow the spin evolution of 10,037 color-selected ETGs more massive than 10$^{10} \rm \, M_{\odot}$ that are divided into four groups: cluster centrals (3%), cluster satellites (33%), group centrals (5%), and field ETGs (59%). We find a strong mass dependence of the slow rotator fraction, $f_{\rm SR}$, and the mean spin of massive ETGs. Although we do not find a clear environmental dependence of $f_{\rm SR}$, a weak trend is seen in the mean value of spin parameter driven by the satellite ETGs as they gradually lose their spin as their environment becomes denser. Galaxy mergers appear to be the main cause of total spin changes in 94% of central ETGs of halos with $M_{vir} > 10^{12.5}\rm M_{\odot}$, but only 22% of satellite and field ETGs. We find that non-merger induced tidal perturbations better correlate with the galaxy spin-down in satellite ETGs than mergers. Given that the majority of ETGs are not central in dense environments, we conclude that non-merger tidal perturbation effects played a key role in the spin evolution of ETGs observed in the local ($z < 1$) universe. |
| spellingShingle | Choi, H Yi, S Dubois, Y Kimm, T Devriendt, J Pichon, C Early-type galaxy spin evolution in the Horizon-AGN simulation |
| title | Early-type galaxy spin evolution in the Horizon-AGN simulation |
| title_full | Early-type galaxy spin evolution in the Horizon-AGN simulation |
| title_fullStr | Early-type galaxy spin evolution in the Horizon-AGN simulation |
| title_full_unstemmed | Early-type galaxy spin evolution in the Horizon-AGN simulation |
| title_short | Early-type galaxy spin evolution in the Horizon-AGN simulation |
| title_sort | early type galaxy spin evolution in the horizon agn simulation |
| work_keys_str_mv | AT choih earlytypegalaxyspinevolutioninthehorizonagnsimulation AT yis earlytypegalaxyspinevolutioninthehorizonagnsimulation AT duboisy earlytypegalaxyspinevolutioninthehorizonagnsimulation AT kimmt earlytypegalaxyspinevolutioninthehorizonagnsimulation AT devriendtj earlytypegalaxyspinevolutioninthehorizonagnsimulation AT pichonc earlytypegalaxyspinevolutioninthehorizonagnsimulation |